Multidisciplinary Optimization of a Blended-Wing-Body Concept

Propulsion and viscous aerodynamic analyses are used to optimize performance of a Blended-Wing-Body configuration including transonic nacelle integration issues. CFL3D with patched grids was used to analyze the aircraft. Color contours respresent pressure levels (red for high, blue for low). A nonlinear, quasi-Newton methodology was used to optimize the nacelle installation. The NEPP propulsion system simulator was coupled with the aerodynamic analysis method to include inlet performance effects in the optimization. The aircraft wing and nacelles were optimized for minimum fuel-burn at cruise conditions.